Echinodermata & Chordates Flashcards
What is the class name of a sea star?
Class Asteroidea
How does a sea star develop?
- central disk merges gradually with arms
- mouth and anus are the same
What are the tube feet with suckers used for?
movement and feeding
What are Ophiuroidea?
brittle stars
What are Ophiuridea like?
- very mobile; pull themselves along substrate
- mouth, BUT no anus
Do Ophiuroidea have suckers and are they used for feeding?
tube feet have no suckers, but still use them for feeding.
What animals are in Class Echinoidea?
urchins and sand dollars
What type of body plan do Echinoidea have?
5 part body plan with tubed feet and spines
What is the class name for a sea cucumber?
What are the two characteristics about this animal?
Holothuroidea
- lack arms
- bilateral symmetry (?)
What is the class name for a crinoid? And what animals are in this class?
Crinoidea
-Sea Lilies, Feather Stars
What are the four hallmark features of Chordates?
- Hollow dorsal nerve cord
- Notochord
- pharyngeal gill slits
- Postnatal tail
Define Notochord
a flexible rod between the gut and the CNS
The non-vertebrate Chordates subphylum are…?
Urochordata and Cephalochordate
Characteristics of subphylum Urochordata?
- tunicates are sessile marine organisms
- only the larval form shows all chordate hallmarks*
The subphylum Cephalochordata’s common name?
lancelets
